For extrinsic semiconductors: when doping level is increased;
A
Fermi-level of 
and 
type semiconductors will not be affected.
and type semiconductors will not be affected.
B
Fermi-level of 
type semiconductors will go downward and Fermi-level of 
type semiconductor will go upward.
type semiconductors will go downward and Fermi-level of type semiconductor will go upward.
C
Fermi-level of both 
type and 
type semiconductors will go upward for 
and downward for 
, where 
is Fermi temperature.
type and type semiconductors will go upward for and downward for , where is Fermi temperature.
D
Fermi-level of 
type semiconductor will go upward and Fermi-level of 
type semiconductors will go downward.
type semiconductor will go upward and Fermi-level of type semiconductors will go downward.
Text Solution
Verified by ExpertsThe correct answer is:
B
In 
-type semiconductor pentavalent impurity is added. Each pentavalent impurity donates a free electron. So the Fermi-level of 
-type semiconductor will go upward. 
In p-type semiconductor trivalent impurity is added. Each trivalent impurity creates a hole in the valenceband. So the Fermi-level of 
type semiconductor will go downward.
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